Rolling-machine.



o. DELLWIIZ.

ROLLING MACHINE.

APPLICATION FILED DEC. 29, I9I4.

@atenta Julie i915.

OSCAR DELLWITZ, 0F TEGEL, NEAR BERLIN, GERMANY.

ROLLING-MACHINE.

Specification of Letters Patent.

Application led December 29, 1914. Serial No. 879,588.

To all fwom t may concern Be it known that I, OSCAR DnLLwrrz, a'

subject of the German Emperor, and resident in Tegel, near Berlin, Germany, have invented certain new and useful Improvements in Rolling-Machines, of which the following is a specification.

This invention relates to pilgering mills and hasv for its object a suitable device for bringing the work and mandrel into the starting position without shock'. For this purpose the mandrel is mounted upon a hollow piston, of two difi'erent diameters, working in acylinder to which compressed air, gas or the-like is supplied. The reduced portion of the piston is provdedwith apertures, of which the area may bevaried, through which the compressed air passes into the space between the reduced portion of the piston and cylinder where the air is still morecornpressed acting as a cushion and i l finally bringing the piston and work to rest without shock.

In the accompanying drawing is illus- 'rotated continuously in the direction of the arrows g indicates the Work and it the mandrel on which the work is rolled and extended. The rear end of the mandrel is y mounted in a hollow piston I), of two different diameters, working in a cylinder a. The

latter is supported by a saddle (not shown y terior of the piston b through apertures c the cylinder and the hollowpiston are bothA into the space between the reduced portion of the piston and the cylinder a.

In the position shown, it is assumed that completely filled with compressed air so that the piston will move in the direction of the arrow ;l/. lVhen the piston has nearly completed its stroke, the apertures c are gradually closed by a'sleeve or socket d mounted in the forward end of the cylinder. Compressed air will then be trapped between the piston and cylinder, this air being still further compressed on the forward movement of the piston so that the speed of the latter' is reduced and the piston finally brought to rest. When the energy ot the moving piston has been absorbed, the highly compressed air between the reduced portion of the piston and the cylinder after bringing the piston and work to rest will cause a recoil in the reverse direction.

In order to be able to increase or decrease this recoil with certainty as desired without shock, the apertures o may be enlarged or reduced in length and breadth by means of a sleeve e provided with similar openings and niovably mounted in the reduced portion of the piston, the position of the sleeve e controlling the passage of air from the reduced portion of the pistonA into the space between the piston and the cylinder.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. In a pilgering mill,. the combination comprising a cylinder adapted to be supplied with a compressed fluid, a piston mounted within said cylinder and adapted to leave a hollow space between a portion of said piston and the forward end of the cylinder, said piston having means of communication with the hollow space and being adapted in its movement to close said means of commnnicationso as to form a cushion, and a mandrel mounted in said piston.

2. In a pilgering mill, the combination comprising a cylinder adapted to be supplied with a compressed fiuid at its rear end, a hollow piston mounted in said cylinder, the rear end of the piston being open and communicating with the cylinder, said piston being so arranged in the cylinder as to form a hollow space between a projectin part of the piston and the forward end o the cylinder, said piston having means of communication with said hollow space, andbeing adapted on its movement to close said means of communication so as to form a cushion, and a mandrel mounted in the forward end of said piston.

3. In a pilgering mill, thecOmbination' comprising a cylinder adapted to be supplied with a compressed fluid, a hollow piston in said cylinder having a reduced portion adapted to pass through the forward end of the cylinder and forming a hollow space around said reduced portion, said reduced 'portion having means of communica- Patented J une il, 1915.

leo

lu @stom in "1t-b movement bengg .aapzed 1c-u @195e said ,fm-sans 0f communcatimi so as t@ ifm-m a cushion, '5 m16. a, mandrel mmmd fm the raducad porivio of the pistafu. n a pilgerng m, th combn'azon comprsimg L cylinder adapted t6 39 sup plied "with :L compmssed Huid, L how pis! t0n in ,said cylner, having a, .redhead pm*- am adap o pass ifuoug'x hfe ,forward A and of the, cye'' and farming z, holow space around said auw; pmtcm, said duced portvn. having mmm of gommunicw tion between @ha 'in or of the bellow ton and 'the bof'iow Space, the piston in iss mqvment ming adapted u Close said. means of @immunisation I:2,0 form a wshml,' means for vmyng h@ moss section of the 20 vir'lesms of communication and 11 mandy@ mount/ad in the reducd @minion of be piston. 5. :in a pilgrng f mll, the combmtimi cfsmprsing cylndm upw' be sup-- space around said ducad portion having means xion befecn Lm in taro uf ih@- ron and .the holmv space, the mmfement bengadapwd to close sum of communicatmn so :1s to form a m; n. seeve having npmuxes moumcd rfeduced. .portion of the psilon., sa. Sy 'being cambi@ of ajmefen in wa'y 'time crass secon Q said k '5 Mon, @unil L1 mandrel mmme. in ik@ pmton of 'the ps-C-l.

ln isstimony Whmo y im@ in px'essepse of ww Wivbmssw.

@SCAR VVnasses HENRY 

